基于柔性设计的光热电站-海水淡化集成系统优化  

Optimization of integrated concentrating solar power-desalination systems based on a flexible design

作　　者：孙启超 孙志伟 伍联营[1] 周鑫 SUN Qichao;SUN Zhiwei;WU Lianying;ZHOU Xin(College of Chemistry and Chemical Engineering,Ocean University of China,Qingdao 266100,China)

机构地区：[1]中国海洋大学化学化工学院,青岛266100

出　　处：《清华大学学报（自然科学版）》2024年第3期528-537,共10页Journal of Tsinghua University(Science and Technology)

基　　金：国家自然科学基金面上项目(21776264)。

摘　　要：全可再生能源与海水淡化集成联产系统可有效解决淡水资源和能源短缺问题。如何设计柔性能力较强的光热电站-海水淡化集成系统以满足复杂天气状况下的用户能量需求是该领域亟待解决的重要课题。该文提出了光热电站与海水淡化集成的水热电联产系统,建立了以集成系统年总费用最小为目标函数的数学模型,该模型为混合整数非线性问题。提出了适用于水热电联产系统优化的柔性指数及柔性设计方法,实现了对柔性指数的定义、计算及边界约束的优化;开发了柔性设计双层算法,外层算法获得系统规模,内层算法优化系统柔性能力。案例研究结果表明:柔性设计结果相较于固定工况设计结果,年总费用下降了10.7%,系统冗余大幅减少;与传统火热供电相比,每年节约用煤166 617 t,减少排放二氧化碳约436 538 t;水、热、电供需比波动得到显著抑制,电能、热能、淡水供需异常比例分别由91.11%、 98.19%、 60.69%下降到0%。案例研究结果表明所提出的系统模型及算法是可行的、有效的。该文基于柔性设计的联产系统对于海水淡化由高耗能产业转换为零排放产业,以及可再生能源向高耗能产业渗透具有指导意义。[Objective]The existing freshwater scarcity and the energy crisis are severely limiting the economic restructuring and social development of the world.An integrated cogeneration system using 100%renewable energy resources and desalination can effectively solve the problem of freshwater scarcity and energy shortage.Desalination technologies such as multistage flash evaporation and reverse osmosis are important means of addressing freshwater scarcity problems.Furthermore,concentrating solar power technology enables renewable energy capture and utilization with lower costs and higher dispatchability.Concentrating solar power can generate electric and thermal energy that can be consumed in desalination operations.Therefore,the integration of the two helps to make the desalination industry environmentally sustainable.However,the existing integrated concentrating solar power-desalination systems have problems such as single-capacity structures and poor system flexibility.The design of cogeneration systems with a high flexiblity for the integration of renewable energy and desalination to meet the user's energy demands under complex weather conditions is a critical challenge in this field.[Methods] This paper proposes a water cogeneration system with integrated concentrating solar power-desalination,comprising a concentrating solar power unit,a heat storage unit,a multistage flash evaporation unit,a reverse osmosis unit,an electrothermal steam generator,and a water storage unit.Furthermore,a mathematical model with the minimization of the annual cost of the integrated system as the objective function is established as a mixed-integer nonlinear problem.Moreover,this paper proposes a flexibility index and a flexible design method applicable to the optimization of integrated hydrothermal power systems,implementing the definition,calculation,and optimization of the boundary constraints of the flexibility index.A two-layer algorithm for flexible design is developed,with the outer algorithm obtaining the system size and the in

关 键 词：光热电站 海水淡化 水热电联产 柔性设计 

分 类 号：TM715[电气工程—电力系统及自动化]